Coral Reefs — Chapter Summary
ICSE · Class 11 · Geography
Summary of Coral Reefs for ICSE Class 11 Geography. Key concepts: Coral is a type of calcareous, When polyps die and Coral polyps need.
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Overview
Coral reefs are large limestone-like marine formations built by tiny sea organisms called polyps. Coral forms a hard calcareous rock from the skeletons of these organisms. Over time, repeated layers of skeletons build up into reef structures that may rise like a wall above the sea surface. Coral ree
Key Concepts
Coral is a type of calcareous
Coral is a type of calcareous rock made of the skeletons of minute sea organisms called polyps. There are about 2,500 species of coral polyps, and the
When polyps die
When polyps die, their skeletons settle on the sea floor. New generations grow on top of the old skeletons, and layer after layer gradually builds a l
Coral polyps need a temperature
Coral polyps need a temperature of 20°C to 30°C, enough sunlight, clear salt water, and depths of 45 to 55 metres. Fresh water, highly saline water, d
Coral reefs are generally found between
Coral reefs are generally found between 30°N and 30°S latitudes. Warm tropical seas provide the best environment for coral growth.
A fringing reef is a coral
A fringing reef is a coral platform built along the coast of a continent or island. It forms a narrow belt with a steep slope towards the sea and a ge
Learning Objectives
- Understand what corals and coral reefs are
- Explain how coral polyps build reef structures over time
- Identify the physical and chemical conditions needed for coral growth
- Distinguish between fringing reef, barrier reef, and atoll
- Locate major examples of coral reefs such as the Great Barrier Reef, Gulf of Mannar, Fiji atoll, Funafuti atoll, and Lakshadweep Islands
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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